I think they can be resurrected. Look at Alabama football in the late-90s/early 2000s. They went through a series of awful coaches, they had some really bad (by Capstone standards) seasons. Mike DuBose, Dennis Franchione, Mike Shula. I think there was a coach in there that got fired before he even coached a game too?
Not saying that Frost is Nick Saban, but when you're at a blue-blood, all it takes is the right coach to recapture some past glory.
Anything is possible but Nebraska can't match Bama's demographics. The two situations are not comparable. There is so much talent within 500 miles of Tuscaloosa. In addition to the homegrown talent, Bama borders Tennessee, Georgia and Florida.